Experiencing a check engine light (CEL) on your 2014 Q50s Hybrid can be concerning, especially when accompanied by warning lights and unusual vehicle behavior. One owner recently encountered this issue, specifically noting a P2859 error code, and is seeking guidance on potential causes and solutions. This article delves into this problem, providing insights for 2014 Q50S Hybrid owners facing similar challenges.
The owner reported that the CEL illuminated alongside the front collision warning light, brake warning light, and direct response hybrid system warning light. This occurred on a cold evening and was initially accompanied by a concerning symptom: a persistent cluttering noise and severely limited movement when attempting to drive. After restarting the vehicle, the immediate driveability issue resolved, but the direct response hybrid system warning light and brake warning light remained on, eventually followed by the CEL.
The error code retrieved from Autozone was P2859, identified as “Clutch A Pressure Disengagement Performance.” This code suggests a potential issue within the transmission system, specifically related to the clutch pressure. While the owner initially suspected battery or electric drivetrain problems, the P2859 code points towards a mechanical or hydraulic concern within the transmission itself.
It’s important to note that the 2014 Infiniti Q50S Hybrid is equipped with a 7-speed automatic transmission, not a CVT as found in some Nissan models like Sentra or Versa mentioned by the owner in their search for related issues. This distinction is crucial because CVT transmission problems are often different from those in a traditional automatic transmission.
Given the P2859 code and the symptoms described, potential causes in a 2014 Q50S Hybrid could include:
- Low Transmission Fluid: Insufficient transmission fluid can lead to pressure issues within the clutch system, triggering the P2859 code.
- Faulty Transmission Fluid Pressure Sensor: A malfunctioning sensor could provide incorrect readings, leading to the error code even if the actual pressure is within range.
- Transmission Solenoid Issues: Solenoids control the flow of transmission fluid to different parts of the transmission, including the clutch. A faulty solenoid could disrupt pressure regulation.
- Internal Transmission Mechanical Problems: While less common initially, internal mechanical issues within the transmission, such as worn clutch components, could also contribute to pressure disengagement performance problems.
- Electrical or Wiring Issues: Problems in the wiring or electrical connections related to the transmission control system could also cause erratic readings and trigger the P2859 code.
For a 2014 Q50S Hybrid owner facing this P2859 code, a systematic diagnostic approach is recommended:
- Check Transmission Fluid Level and Condition: Inspect the transmission fluid level and condition. Low or dirty fluid could be a simple fix.
- Professional Diagnostic Scan: While Autozone provided the P2859 code, a more in-depth scan using professional-grade diagnostic tools at a qualified repair shop or Infiniti dealership is recommended. This can provide more specific information and potentially reveal other related codes.
- Consult a Transmission Specialist or Infiniti Technician: Given the complexity of hybrid powertrains and automatic transmissions, seeking expert advice is crucial. A transmission specialist or Infiniti technician can accurately diagnose the root cause of the P2859 code and recommend the appropriate repair.
While it’s understandable to be concerned about expensive repairs like transmission replacement, a thorough diagnosis is the first step. Addressing a P2859 code promptly can prevent further damage and ensure the longevity and performance of your 2014 Q50S Hybrid. It’s essential to avoid simply “throwing parts” at the problem and instead rely on expert diagnosis to pinpoint the exact issue and implement the correct solution.
